The Firing Line Forums - View Single Post - Recommendation for machining brass casings

HiBC · September 12, 2010, 11:21 PM

Reducing a rim dia is not going to make the case weak.It is no problem,
However,if at all possible,you might consider opening up the chamber rim recess and adjusting the extractor.(Or the boltface,depending..)You only have to do that once.
I have access to a fine old South Bend with a 5C collet setup and a taper attachment.While I could get a soft collet and bore it,likely I would just make a shouldered bushing to fit in a 5c collet,with the ID tapered to fit the body of the cartridge.Then I might slice one side with a bandsaw so it could clamp a bit.
If you have to do it stone knives and bearskins,tell me what you have to work with,and I'll try to give you a setup idea.
If you have a good quality drillpress with a fairly precise,rigid spindle we can make that work.Its a spindle.What is your parent case?

September 12, 2010, 11:21 PM	#4
HiBC Senior Member Join Date: November 13, 2006 Posts: 8,286	Reducing a rim dia is not going to make the case weak.It is no problem, However,if at all possible,you might consider opening up the chamber rim recess and adjusting the extractor.(Or the boltface,depending..)You only have to do that once. I have access to a fine old South Bend with a 5C collet setup and a taper attachment.While I could get a soft collet and bore it,likely I would just make a shouldered bushing to fit in a 5c collet,with the ID tapered to fit the body of the cartridge.Then I might slice one side with a bandsaw so it could clamp a bit. If you have to do it stone knives and bearskins,tell me what you have to work with,and I'll try to give you a setup idea. If you have a good quality drillpress with a fairly precise,rigid spindle we can make that work.Its a spindle.What is your parent case? Last edited by HiBC; September 12, 2010 at 11:40 PM.